Scfilter Cid87d25e32ac0d4ef0b1e0502c6b7dfb77 Patched High Quality -
The string cid87d25e32ac0d4ef0b1e0502c6b7dfb77 is a generated by Windows to identify a specific smart card minidriver .
To protect against this vulnerability, it is essential to apply the patch as soon as possible. Organizations should prioritize patching systems that are most critical to their operations, as well as those that are most vulnerable to exploitation.
Right-click the problematic device in -> Update driver . Click Browse my computer for drivers .
As a result, Windows constantly tries to install a "NULL Driver" or leaves the item marked as an "Unknown Device" under the section in Device Manager. Symptoms of an Unpatched SCFILTER Driver Conflict scfilter cid87d25e32ac0d4ef0b1e0502c6b7dfb77 patched
Set the value to to allow standard cryptographic operations. 2. Update via Windows Update
The Windows kernel filter driver, scfilter.sys , intercepts this ATR string and maps it using an internal bitmask registry schema found within the Windows Cryptography Calais Registry Node : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Calais\SmartCards
While patching a driver can solve hardware interoperability problems, it comes with risks: Right-click the problematic device in -> Update driver
The scfilter cid87d25e32ac0d4ef0b1e0502c6b7dfb77 identifier refers to a Smart Card PnP Class Filter Driver, which, when marked as "patched," indicates that Microsoft security updates have blocked the driver or changed authentication methods, causing hardware to fail. Recent updates, particularly around October 2025, forced a migration from Cryptographic Service Providers (CSP) to Key Storage Providers (KSP), causing widespread compatibility issues. For more details on the authentication issues, visit BleepingComputer . Smart card PnP Class Filter Driver - Windows 11 Service
Microsoft®Update Catalog · FAQ|help. view basket (0). "SCFILTER\CID_19c80050". Updates: 1 - 4 of 4 (page 1 of 1). Previous | Next. Microsoft Update Catalog Install Windows Updates - Microsoft Support
When a physical smart card or a virtual smart card reader profile matching this CID is active, Windows Update may continuously poll Microsoft servers looking for a driver that does not exist. This creates endless background resource usage and poll cycles. 2. Kernel-Level Security Flaws Symptoms of an Unpatched SCFILTER Driver Conflict Set
: In the context of a system log or a security tool's "fixlist," this status typically indicates that the specific driver entry or associated registry key has been modified, repaired, or acknowledged as secure by a recent security update or a cleanup tool. Why you are seeing this
If your organization uses a unified middleware solution (such as ActivClient or 90Meter) and does not require the native Windows PnP service to search for minidrivers, you can patch out the error by disabling the PnP feature entirely. About Smart Card Minidriver Filter Driver(SCFILTER) - NTDEV
The identifier CID87D25E32AC0D4EF0B1E0502C6B7DFB77 is a unique code associated with a specific vulnerability or patch within the SCFilter. This code is used to track and reference a particular issue or fix in the vast database of Microsoft's security updates. When a vulnerability is discovered in SCFilter, Microsoft assigns a unique identifier, such as CID87D25E32AC0D4EF0B1E0502C6B7DFB77, to ensure that the issue can be easily identified and addressed.
If the patch is applied correctly, the tool will completely bypass any "Unknown Device" warnings, read the token container seamlessly, and display the valid root certificates tied directly to CID_87d25e32ac0d4ef0b1e0502c6b7dfb77 . To narrow down your fix, please share: